Even versions of Zi Xiu Tang Bee Pollen labeled "genuine" and "anti-counterfeit" have been found to contain the drug sibutramine, which was supposed to come off the U.S. market in 2010 for safety reasons. Food and Drug Administration hide caption

itoggle caption Food and Drug Administration

Would you think twice about that 20-ounce soda if you were informed that it would take 5 miles of walking — or 50 minutes of running — to burn it off? Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

A sign displaying calorie counts is seen in a Subway restaurant in New York City in 2008. A yet-to-be-finalized federal rule requiring big chain restaurants to post calorie counts has likely led eateries to tweak their menus. Mario Tama/Getty Images hide caption

itoggle caption Mario Tama/Getty Images

Photos from Liz Paul's blog entries on Prior Fat Girl. The blog chronicles women's weight loss journeys. Courtesy of Liz Paul/PriorFatGirl.com hide caption

itoggle caption Courtesy of Liz Paul/PriorFatGirl.com

Carlos Romero and girlfriend Kate Rowe sit down for a meal they cooked together. Two years ago, Carlos Romero weighed 437 pounds. Mike Kane for NPR hide caption

itoggle caption Mike Kane for NPR

Tokens representing $1, which can be used specifically for fresh fruits and vegetables, are displayed at a Electronic Benefits Transfer, or food stamp, station in the GrowNYC Greenmarket in Union Square on September 18, 2013 in New York City. Andrew Burton/Getty Images hide caption

itoggle caption Andrew Burton/Getty Images

In one study, people who were in a buffet line served themselves a lot more of an unhealthful pasta dish if they were next to or behind a person perceived to be overweight. iStockphoto hide caption

itoggle caption iStockphoto